Heat guard



C. T. BRADY June 18, 1929.

HEAT GUARD Filed May 29, 1928 2 heets-Sheet June 18, l929. -c T BRADY1,717,756

HEAT GUARD Filed May 29, 1928 2 Sheets-Sheet 2 {I Home o Patented June18, 1929.

unrrsn STATES CHAR-LES T. BRADY, 013 DETROIT, MICHIGAN.

HEAT GUARD.

Application filed May 2%}, 1928. Serial No. 281,513.

The present invention pertains to a novel heat guard constructedparticularly for application to a housing of a projector light. Ahousing of this character becomes very hot when the lamp therein isilluminated, and the object of the present invention is to provide adevice to prevent the hands of the operator or other persons from comingin direct contact with this housing.

The guard is constructed and supported around the lamp housing in such amanner as to receive a minimum quantity of heat from the latter and topermit radiation of the major portion of heat to the air. in order tofulfil these functions, the metallic surface of the device is renderedcomparatively small by constructing the guard in the form of a wirecage. Further, the cage supported spacedly around the lamp housing andis held in such position by grip members bearing on the housing andhaving only a single point contact with the cage, as a result of whichthe direct conduction of heat from the housing to the cage is verysmall.

'The invention is fully disclosed by way of example in the followingdescription and in the accompanying drawing, in which- Figure 1 is aside elevation of the device;

Fig. 2 is a rear end View;

Fig. 3 is a longitudinal section, downwardly; and

Fig. 1 is a front end view.

Reference to these views will now be made by use of like characterswhich are employed to designate corresponding parts throughout.

The projector unit to which the guard is applied includes an upright 1supported in vertical position in any suitable manner and having a lampsocket 2 at its upper end. A ring 3 is fitted around the upright,beneath the socket, and has a pair of arms 4: extending upwardly thereofin spaced relation to the socket as shown more clearly in Figure 1. Alamp, (not shown) is inserted inthe socket and surrounded by a housing 5resting on the upper ends of the arms 4. Since the housing does notdepend on the socket for its support, the aperture in the base of thehousing for accommodating the lamp may be of greater diameter than thesurrounded part of the socket so that the apertured wall need not engagethe socket. This arrangement reduces transmission of heat from thehousing to the socket.

The guard applied over the housing is in the t rm or wire ease f similarlooking tional configuration to that of the housing but of larger area.

The front and rear ends of the cage consist of wire frame members 6 and7 respectively having the configuration previously mentioned, whilecertain sides 8 of the rear frame may be bent inwardly as shown inFigure 3. At the bottom of the cage, the front rame 6 has an open'side9, and the cage structure is completed by spaced parallcl wires 10joining the end frames 6 and 7 for forming the lateral walls of thecage.

A yoke 11 is mounted in the slot 9 and has its open side exposed to themouth of the slot while its ends 12 are secured to the wires 10 definingthe edges of the slot. A number of lingers 13 depend from the yoke andhave their lower ends bent inwardly as at lat and secured to anotheryoke 15 somewhat similar to but smaller than the member 11. The yoke 15supports a clip 16 adapted for attachment to the upright support 1,whereby the members 10-15 form a cage surrounding the socket and spacedtherefrom. The back of the yoke is supported by short strands 17extending therefrom to the end member 7 in parallel relation to thewires 10.

At points spaced peripherally around the main wire cage, fingers 18 aresecured to certain of the wires 10 and set to extend somewhat inwardlyas well as peripherally of the cage as may be seen by reference toFigure 2. The fingers are in fact wire members similar to the members 10and are prolonged or extended to form grip members. The grip members,continuing from the peripherally extending fingers 18 include each abranch 19 lying longitudinally of the cage and disposed forwardly of thecorrespond ing finger 18, a coil 20, and a return branch 21. The free orrear ends of the branches 21 support an inner frame 22 spaced from therear frame 7 and from the surrounding wire 10.

The device is applied to a lamp housing by merely being slipped over thesame so that the socket lies in the slot 9 and lower cage 11-15 and theclip 16 engages the support 1 as already stated. The gripping members 1821 go into engagement with the outer wall of the housing, and maintainthe cage spaced from the housing because of their positions within thecage. Heat is conducted. from the housing direetl to the wi e tnnt'iureenly at the points there the grip members engage the housing. From thesepoints this heat is conducted only to the several Wires to whichattached. Otherwise, the cage receives no heat by direct conduction forit will be seen that the inner frame 22 supported by the branches 21 hasno other connection to the cage proper. The direct contact between thelamp housing and the cage structure is thus reduced to a very small areaso that the major portion of the heat is permitted to be taken up by theatmosphere rather than by the protecting cage. In keeping with thisobject of holding the gripping members out of contact with the cageexcept where es sential, the wires 10 directly adjacent the grippingmembers are bowed outwardly as at 23 as shown more clearly in Figures 2and 4. v 7

Although a specific embodiment of the invention has been illustrated anddescribed, it will be understood tl'iat various alterations in thedetails of construction may be made without departing from the scope ofthe invention as indicated by the appended claims.

'What I claim is:

1. A heat guard comprising a wire cage, grip members having each asingle point attachment to said cage and extending inwardly therefrom, aframe inside said cage and spaced therefrom, said frame being connectedto and supported by said fingers.

2. A heat guard comprising a wire cage, fingers inside said cage andhaving each a single point attachment thereto, grip members carried bysaid fingers, said members being spaced inwardly from said cage andextending longitudinally thereof, and a frame inside said cage andspaced there from, said frame being supported by said members.

3. A heat guard comprising a wire cage, fingers inside said cage andhaving each a single point attachment thereto, grip members carried bysaid fingers, said members being spaced inwardly from said cage andextending longitudinally thereof, a frame inside said cage and spacedtherefrom, said the fingers 18 are frame being supported by saidmembers, and a socket cage depending from said first named cage andadapted to be spaced around a socket received therein.

4. A heat guard comprising a wire cage, grip members having each asingle point attachment to said cage and extending inwardly therefrom, asocket cage depending from said first named cage and adapted to bespaced around a socket received therein, and a clip carried by saidsocket cage.

5. A heat guard comprising a wire cage, lingers inside said cage andhaving each a single point attachmentthereto, grip members carried bysaid fingers, said members being spaced inwardly from said cage andextending longitudinally thereof, a frame inside said cage and spacedtherefrom, said frame being supported by said members, a socket cagedepending from said first named cage and adapted to be spaced around asocket received therein, and a clip carried by said socket cage.

6. A heat guard comprising a wire cage, fingers inside said cage andhaving each a single point attachment thereto, grip members carried bysaid fingers, said members being spaced inwardly from said cage andextending longitudinally thereof, and a frame inside said cage andspaced therefrom, said frame being supported by said members and saidcage having a slot in its bottom adapted to loosely receive a socket.

7. A heat guard comprising a wire cage, fingers inside said cage andhaving each a single point attachment thereto, grip members carried bysaid fingers, said members being spaced inwardly from said cage andextending longitudinally thereof, a frame inside said cage and spacedtherefrom, said frame being supported by said members and said cagehaving a slot in its bottom adapted to loosely receive a socket, and asocket cage depending from said first named cage at said slot andadapted to be spaced around a socketreceived therein.

In testimony whereof I affix my signature.

CHARLES T. BRADY.

